Systemic haemodynamic effects of biofeedback in borderline hypertension

Area of Science:

• Cardiovascular Physiology
• Behavioral Medicine
• Hypertension Research

Background:

• Borderline hypertension poses a risk for future cardiovascular events.
• Non-pharmacological interventions are sought to manage elevated blood pressure.
• Biofeedback (BFB) offers a potential avenue for self-regulation of physiological parameters.

Purpose of the Study:

• To investigate the effects of exteroceptive biofeedback (BFB) training on arterial pressure in patients with borderline hypertension.
• To elucidate the hemodynamic mechanisms underlying blood pressure changes induced by BFB.
• To compare the hemodynamic effects of BFB with those of beta-adrenoreceptor blockade.

Main Methods:

• Six patients with borderline hypertension participated in exteroceptive BFB training.
• Systemic hemodynamics, intravascular volume, and plasma renin activity were measured before, during, and after training.
• Patients were trained to either increase or decrease their arterial pressure.

Main Results:

• BFB training significantly reduced mean arterial pressure (116 to 101 mmHg) via decreased total peripheral resistance.
• Cardiac output, heart rate, intravascular volume, and plasma renin activity remained unchanged during BFB-induced blood pressure reduction.
• Increases or decreases in arterial pressure during BFB were primarily mediated by changes in cardiac output and heart rate, respectively, with unaffected peripheral resistance.

Conclusions:

• Exteroceptive BFB training effectively lowers arterial pressure in borderline hypertensive individuals.
• The primary mechanism for BFB-induced hypotension involves a reduction in total peripheral resistance.
• The hemodynamic profile of BFB resembles that of beta-adrenoreceptor blockade, suggesting a potential non-pharmacological therapeutic strategy.